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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ddd8e9f54d2689b236c5c9b9c56bb46efc4d7dda60ea3363ca8b31bf4e89c5' 
  AND token = 'GKcDyrnQ0G1N2unZxUEnw151zc7yLJ64YVfgwg5RBE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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