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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6e7ff0db2c3071481e1444e42363bfe04096387ab673747024d427e5b5d8b9' 
  AND token = 'QiOPP4TMUm0ooeXsX6EKQU101JsdGfBM6pRCaMjzAGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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