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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaba306f21435d624a3e09517dad3956e43cd3830b6880980c9eb3fbb6b57f47' 
  AND token = 'LcmhLYx4l3DiGg9XXO+EstQHnDYrXYOhvlT0tEiP3ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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