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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecb4ebe6725b868b4e94f30487f162bf7cd11345d559cef68e2f30150dc81e8' 
  AND token = 'zEQtLlCvUUo+2eWaWZvwk5NUp2wfE9UEPrzU8mv87ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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