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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa66ecec12d88464e37c6a00ade9f01d78bc1b8940e63dd555ef841e7984e9d' 
  AND token = 'uKpB4OO5v5Zy09AKjp5aWuaQRamOBx5aAyKZZ9a9lJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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