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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb4b5677ae2e93e43bf4949236818598db70585243fd2b63657707d98b2ca6b' 
  AND token = 'WpJOTDi5QjkPA9A801qlBO6Fm9UsDEUp//2TiegJMPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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