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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccb839caa6eb4da2ee23caad8a3aa4af62677bbdbbb13773aed5c137ec7986c' 
  AND token = '0ZIxndLT41FcEty8h1QUUZAjt+ViOLbl42B0n1fqNgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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