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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9a4f5f33abffc4db67ff085280d186a84b32115ea2b481b241979142af0e2f' 
  AND token = 'kMrnr8Y8coIGYnp/iqT+TOEOTS9H88rNIiLaih2cj5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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