SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71b496bf763525b9965feb8dbd183d1fc20250a34ab20466eaf629d0a53589b' 
  AND token = 'U7n/9p4fBDYBPTVpjfgDZR2jBbIsMvAUe97zPM+ggj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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