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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6428b84c7903df89cfbc9750a777868a15c664663ccc8e5f1b2c06d8a17b6a53' 
  AND token = 'Itlg1wx5DhUB8YAwxoPhabQWTpvEukmGx5lnayPl5Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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