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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53e30cc74c9c4edcab397d7b0d40453bb64a848ec9d0a3fdfff89675630dcd1' 
  AND token = 'VM98LK6UOBbndKug2GDvDrHo37m7U6oHyqH+F4XOoU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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