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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa2315cd9cd1b1ce8a6dd7d82ed1b664e634d8b49b244e1d40b122e3512d4fb' 
  AND token = 'HnX9k9EgushaLzz6Ylbdlcj1yoEaCZRqoZlM3TJalfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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