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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6676317ea670ab56396a8204ebc08a3bf1d329b7f7d26268011bf4379ba1c051' 
  AND token = 'qN90ZPx+KEwTR+lVqheMi8jEcf5uInmHYacWIhxDaqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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