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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c547383b64dc7a589b6df227ba08e00020bdeb7c7f44a8b1ebe4dc29ba43fe6d' 
  AND token = 'k4IkCL5jGAwZZzvay4n99ze5ZQRbz7hPhQUrREZzFNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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