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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267020ee62c3ba774871f27d8244af27bd2b871821c31d59296846f0cbb4c28c' 
  AND token = '3TWreeY1ZoDzRzM4jFp6UKhMrUb6574CW/rEVe8eaQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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