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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdc4461c351e1ccc5881b022245b78e806e8a5ad32bda67ce402998a50d63ff' 
  AND token = '1vucfMBQx+pXAsjrkWgdejl0lNih7jrTRoLRBKeZpNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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