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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42331a867c7490ac2334ab0946c3a9a24c662b847614427d05cbf51350c2703' 
  AND token = 'K7ccLorwuF6enL0IoYjCXi8mswz6vhqwxVNcCq0Yyc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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