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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c3eadd82b39f1e01aa8cdaa40f82570f7a7b114ea3b21325ce2f8ff0506d7d' 
  AND token = 'i9sdo3H8c3xDH/32bat+cLvtWxJEOgTdTaGT376wlSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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