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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04e289a1397a1bd2c91a246e0309790263de7eda41ee44e45834dbf7eb6a80a' 
  AND token = 'ddzNnnEyNlmOekC+H2zgPAbInD/Zd5roQ02Y8fU+GI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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