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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f982115b10ae4c5399ca1d0ad95b7cfbd309cf7c82b4877cff88116e6792b8f' 
  AND token = 'CW62+LP96ShtVgLGxDyu8BzeLH7d5hWl6Y6A6JQSyfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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