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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da174887fcf4b9434dbc5529011e29c8bff5c6913afe957b365d51587aa60b63' 
  AND token = 'UwADNCXvNRIdVutJtTH7C9A0J7wuX5nAv1W40f5bgKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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