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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3db3984bd053618dfc0b135861ee437f75576b3583c09ab086a69666aac7d6b' 
  AND token = 'Ok2uK1lPELes+q63sJ8q+TVRVW4TB3ulPQfncMMIM4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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