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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7863f260149efc39f22ac141817d44ea3f921e673a716ac8bd924348bf86c99a' 
  AND token = 'pl63i9hlN0uNgBUTiexCBlct3mjfEqhv8MNgNXI4zTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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