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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f5da72b843c51ec713f9e551c3ae701e6dba2038dab534f9cd55860cf1453d' 
  AND token = 'H+6zeDCv3asWCng+k4Z/0h103Zm71MFbbmEwIiRFEUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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