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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb4c862b4a75652df443f3f02ebc8659fd55b3ab482667d43ce4610b0ac254e' 
  AND token = 'NUu6uooklKZmIjJm3s+Xi3blZ7SuCpuT3he6ggyQkvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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