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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac1ffc673bc158016b6bc489a99f05901f2761add1860f65cd465283728ea67' 
  AND token = 'K+xmmHbUWtA73Aciov6jzIvt+GjNqwpacdIz0Vmo5uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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