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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f59d250032925cc2782b19f592af6b604de366bd8714782516f9ddc908ec01' 
  AND token = '9z4mfFsDrk303q+tMK9IzifuPkn0SSkrdZY/heX+SOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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