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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7964de4d4f88f3492ecd4221a67421d830b7114b147c8a5cb8bdce92391a22b5' 
  AND token = 'g8Rb9qDO0dGDnp7Tc8pAjP9Sx/cz6wK9vBqRtr54kTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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