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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb70957b46faff6a7acd7eca60f8cb6c2ff1392ef3b66f3f19b3186371864b4' 
  AND token = 'jaiaM6x/J1BsAhe+jptQUjipvM+YVQUz2hYyS8Kfbo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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