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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62de844e26b793d1cfebc9d336bae32dc05f89155092983c5cb9f08435eed9b' 
  AND token = 'flSY/2QGue4PLx8+j8O6yVXhDt473HUlcRx3hW69Rek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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