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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9cb139c2205e04c9b8cecce41fd6697e8215212dbd1a8bc3be565d4da7304e' 
  AND token = 'grff3ihbTemy10tbakd9/twe9SwoYaobsP0dj7704Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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