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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9676e7503eb168e16662e3fb4bbfb66a4854a9eac404c121a2d81bafb07a2d5' 
  AND token = 'kndF+P0cRX828jk5IIF2kpkfgi5eC9+hDbGKL6j686E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}