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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10325c93ac4138c38c3df9a5e624829a764e4d9d789aa262ee8fdf3b07293a34' 
  AND token = 'ZPYxAnz7RaNA7AQIh0RIvg0WfHsPfwbHAiN9GnesWvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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