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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dd440f206812d32d2e233f7130a9f634e90a518157e06ec36ee20d59b192c8' 
  AND token = 'STi/LQe+i1qbbK7BEOrywB8oY2BxVxZeQGEYAeFqVzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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