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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28efa969592c8b3d3b845d60d40572db1f96f2398a5b03e8eaa71d2b26663074' 
  AND token = '0Z/V59PghTwk7DAIaT6tm1FwkdW798SSYxhwRUn2UGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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