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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f722b8724d965ec6205e128384d04f4c5ab2f55ae334898ad4e9e3ae01b2b5c3' 
  AND token = 'f+8Ip+L7mqdq70gLYpeLzP6FHHPhwmDW0C7mqoTN7uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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