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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e43b4a36b4bd6b1ed86839db153694311583d0c68c76910d622d1e0766fe7bbe' 
  AND token = '4WHhQpMk6gfURuqw5t3ZBMunH4i28UiE049JpvNz8fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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