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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5c66e87ec52720608d67117ce081e8ca22c97802227e8be578a58e688a1acf' 
  AND token = 'eoZ+68eKPP1hOeJEcguLdwlV7XgB3qOY0J7bSaVLoBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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