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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1da3f98c69d266d718d203229dc96d08b1fcbe4f0a95d6ba2ebe79af6eaed1b' 
  AND token = 'Vkj5bVGmAbbC5pGC1L3rXqWv+KlWekP033n6uWqsAN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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