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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74dc2dd4b469ed5f752d0c2bad64f256401c8b7f973b3c2c5fb0ded7d7b0d109' 
  AND token = 'YIfjqG/Y06wYCN/Mo0v6zv/NKajVEcjxL/L4htZaf3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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