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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231a3a1929b6f69c1b4bcb0872a8b4c3e54d2bcc699cd29e76a84fdc6cd1ee8e' 
  AND token = 'P66anZ4SgJ1ES6cgH4yQzU0cQiUZxSAbO2QKD7g09l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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