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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c96fd573c8cb1ea3cc0a798257574cd2bc7ed8fea96b0201e94201b39c1435' 
  AND token = '33xdrU15ib438I/DF93crQVReTR8b+p3w1rJ96jiC2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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