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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8daa7e4f1e76f27037039e15be08e774dd1d28580efdf12a68de670b45b9f120' 
  AND token = 'pWRa6R1dEAirFLSbX2uG4PU91p/fdVcXKrilv9qC9ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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