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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7faca55464c0653cf6e65aae91d22d2291e17022ef89183a8c04eac4c5da7133' 
  AND token = 'X640130krt1v0RZ6rAFXTTtyTjDLu6bIwPqCU2S6k6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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