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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688450df196da57a4945d74af5b9b5c19fe8d23ca91408b0500fbd1c4692834b' 
  AND token = '23h1F3kktdrCrJEXJcDeQhyjl7ezDQZyOsPI84DkVrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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