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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c3368686d910ff4989142fb4c2585dcbe1cf5655665e4bd6ecd18eabc0c524' 
  AND token = 'hzU4sNxmtMaXzBDO9FA1Sxau0cOEGq0LwUdz4q81sWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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