SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b96a5d3243b6018c1c637998de7681f07e71f4c8b297032a7464d5ba290db09' 
  AND token = 'cWAUKdiWnm4KYoJCrqn3/rZqbw18/ZtJBw7iUamllCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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