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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04a278097a0a4f729e445549c294848077af8eaefe158e1b6572e0c5f0b52ea' 
  AND token = 'gS56mI/UD+f+cBQWOi3g2kSvw3JMHOabDbxtcAXb8+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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