SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e07b283508c2445932402ca3a96951a0f1b68c7442698b0d6995f7f190c75bf' 
  AND token = 'ZQZ5U9wdigsaQgRol+tHXpYwd/AE/6g1apYURXuj8x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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