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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8189231057d5455108f1dc7064a45e18ed54f6c0d12da64079da01b81d243e2c' 
  AND token = '2MkcRudqG5obXQCnx1eWxk7ush06c6QahYe0kw6C12g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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