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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7700bf60fdf362ee74eb146cfc79b4125c584aca996b76b9473753f89072de' 
  AND token = 'fYFyLh97jeEA4lLERezOIBYg7VH9JXF/8CSYze4+urI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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