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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9ee4bbc231c8c8ac5e35967fe3a3f357a4550b91ffe789a06ef10efffafdd2' 
  AND token = 'jFcshfkQrlCNobS9qhZEtKK7qDGsOyarfC0juYTvrNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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