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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcb33d892eed429f4b6e43cc8bebbf08862f1fd7a914ef1b7d4acd25b4c4900' 
  AND token = 'L+zphGYvCWTf3mBUdfXrLE5W9NRFLMA9VC2ZMCWgLnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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