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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628ee1325902f7872da8d9a78188439c2460124f5c0ef7ad12a457580551c32f' 
  AND token = 'quwZrcL2vGH84RStaP2F8G6QfucbLeTQ3Gup2oqEqoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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