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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a28a3532e82458138ee56d8575514aacc41ca833abc34704b7a0f2f63ccb7fa' 
  AND token = 'GLhhK6N4ploqQQji0rg+UjZpFj9fY0QfokE4nojnCXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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