SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd533f54c9cf4d61e9218e552031b07ab9f9b6b1e52f9748c1c6f025d3f35d76a' 
  AND token = '3GBpXfZnAklfxUFlpSRPNU+i4HwZuGBh4niFfghLfFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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