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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2465c5aeafe65611d85eca480950f377f21ef3718b33224b899c4065900791ff' 
  AND token = '5sZzy57leWJL5LBYbyoJ68U2Y7EASa1xxe6I7S0bQx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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